Backpack



FIG. 1 is a perspective view of a backpack showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The unshaded regions, demarcated by broken lines, within or adjacent to the shaded area form no part of the claimed design. The structural features depicted by broken lines have been shown for the purpose of illustrating portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 